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[S390] pm: netiucv power management callbacks. 

Patch establishes a dummy netiucv device to make sure iucv is notified
about suspend/resume even if netiucv is the only loaded iucv-exploting
module without any real net_device defined.

The PM freeze callback closes all open netiucv connections. Thus the
corresponding iucv path is removed.
The PM thaw/restore callback re-opens previously closed netiucv
connections.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Ursula Braun 2009-06-16 10:30:43 +02:00 committed by Martin Schwidefsky
parent 672e405b60
commit 1175b257c8
1 changed files with 109 additions and 6 deletions
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115
drivers/s390/net/netiucv.c
View File

@ -1,11 +1,15 @@
/*
* IUCV network driver
*
* Copyright 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
* Copyright IBM Corp. 2001, 2009
*
* Sysfs integration and all bugs therein by Cornelia Huck
* (cornelia.huck@de.ibm.com)
* Author(s):
* Original netiucv driver:
* Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
* Sysfs integration and all bugs therein:
* Cornelia Huck (cornelia.huck@de.ibm.com)
* PM functions:
* Ursula Braun (ursula.braun@de.ibm.com)
*
* Documentation used:
* the source of the original IUCV driver by:
@ -149,10 +153,27 @@ PRINT_##importance(header "%02x %02x %02x %02x %02x %02x %02x %02x " \
#define PRINTK_HEADER " iucv: " /* for debugging */
/* dummy device to make sure netiucv_pm functions are called */
static struct device *netiucv_dev;
static int netiucv_pm_prepare(struct device *);
static void netiucv_pm_complete(struct device *);
static int netiucv_pm_freeze(struct device *);
static int netiucv_pm_restore_thaw(struct device *);
static struct dev_pm_ops netiucv_pm_ops = {
.prepare = netiucv_pm_prepare,
.complete = netiucv_pm_complete,
.freeze = netiucv_pm_freeze,
.thaw = netiucv_pm_restore_thaw,
.restore = netiucv_pm_restore_thaw,
};
static struct device_driver netiucv_driver = {
.owner = THIS_MODULE,
.name = "netiucv",
.bus = &iucv_bus,
.pm = &netiucv_pm_ops,
};
static int netiucv_callback_connreq(struct iucv_path *,
@ -233,6 +254,7 @@ struct netiucv_priv {
fsm_instance *fsm;
struct iucv_connection *conn;
struct device *dev;
int pm_state;
};
/**
@ -1265,6 +1287,72 @@ static int netiucv_close(struct net_device *dev)
return 0;
}
static int netiucv_pm_prepare(struct device *dev)
{
IUCV_DBF_TEXT(trace, 3, __func__);
return 0;
}
static void netiucv_pm_complete(struct device *dev)
{
IUCV_DBF_TEXT(trace, 3, __func__);
return;
}
/**
* netiucv_pm_freeze() - Freeze PM callback
* @dev: netiucv device
*
* close open netiucv interfaces
*/
static int netiucv_pm_freeze(struct device *dev)
{
struct netiucv_priv *priv = dev->driver_data;
struct net_device *ndev = NULL;
int rc = 0;
IUCV_DBF_TEXT(trace, 3, __func__);
if (priv && priv->conn)
ndev = priv->conn->netdev;
if (!ndev)
goto out;
netif_device_detach(ndev);
priv->pm_state = fsm_getstate(priv->fsm);
rc = netiucv_close(ndev);
out:
return rc;
}
/**
* netiucv_pm_restore_thaw() - Thaw and restore PM callback
* @dev: netiucv device
*
* re-open netiucv interfaces closed during freeze
*/
static int netiucv_pm_restore_thaw(struct device *dev)
{
struct netiucv_priv *priv = dev->driver_data;
struct net_device *ndev = NULL;
int rc = 0;
IUCV_DBF_TEXT(trace, 3, __func__);
if (priv && priv->conn)
ndev = priv->conn->netdev;
if (!ndev)
goto out;
switch (priv->pm_state) {
case DEV_STATE_RUNNING:
case DEV_STATE_STARTWAIT:
rc = netiucv_open(ndev);
break;
default:
break;
}
netif_device_attach(ndev);
out:
return rc;
}
/**
* Start transmission of a packet.
* Called from generic network device layer.
@ -1731,7 +1819,6 @@ static int netiucv_register_device(struct net_device *ndev)
struct device *dev = kzalloc(sizeof(struct device), GFP_KERNEL);
int ret;
IUCV_DBF_TEXT(trace, 3, __func__);
if (dev) {
@ -2100,6 +2187,7 @@ static void __exit netiucv_exit(void)
netiucv_unregister_device(dev);
}
device_unregister(netiucv_dev);
driver_unregister(&netiucv_driver);
iucv_unregister(&netiucv_handler, 1);
iucv_unregister_dbf_views();
@ -2125,10 +2213,25 @@ static int __init netiucv_init(void)
IUCV_DBF_TEXT_(setup, 2, "ret %d from driver_register\n", rc);
goto out_iucv;
}
/* establish dummy device */
netiucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
if (!netiucv_dev) {
rc = -ENOMEM;
goto out_driver;
}
dev_set_name(netiucv_dev, "netiucv");
netiucv_dev->bus = &iucv_bus;
netiucv_dev->parent = iucv_root;
netiucv_dev->release = (void (*)(struct device *))kfree;
netiucv_dev->driver = &netiucv_driver;
rc = device_register(netiucv_dev);
if (rc)
goto out_driver;
netiucv_banner();
return rc;
out_driver:
driver_unregister(&netiucv_driver);
out_iucv:
iucv_unregister(&netiucv_handler, 1);
out_dbf: